Reverse-phase relay.



No. 854,741. 1 PATENTED MAY 28, 1907. E. M. HEWLETT.

REVERSE PHASE RELAY.

APPLIOATIONIILED MAY 4.1906.

Witnesses. I Invntor:

.611 1 m. Edward M. Hewlett UNITED sTATEs' EDWARD HEWLETT, or scHENEoTADY, N W 1YoRK, AssIeNoR To GENERAL ELECTRIC COMPANY, A CORPORATION on NEW YORK.

ATENT OFFICE.

REVERSE-PHASE RELAY.

Patented May 28, 1907.

5a citizen of the United States, residing at Schenectad county of Schenectady, State 5 of New Yor have invented certain new and useful Improvements in Reverse-Phase Relays, of which the following is a specification.

My invention relates to protecting devices for polyphase c1rcuits, and 1ts object is to provide a simple and efiicient relay adapted to 0 en such a circuit upon a relative reversal of t e phases thereof.

In certain cases it is important that a polyphase circuit should be opened immediately upon a relative reversal 0 the phasesl Thus, for instance, in the case of an elevator driven by a polyphase motor, if the phases should become relatively reversed by accident the direction of rotazo rious consequences might ensue if the motor tion of the motor would be reversedand-secircuit were'not immediately broken. For

. cases of this kind reverse-phase relays have been devised heretofore consisting essentially of a small polyphase induction motor 2 5 with the primary coils energizedfrom the polyphase circuit to be protected and a pivoted armature controlluig the tripping circuit of switches in the 'polyphase circuit. Upon a reversal of phase in the main circuit the direction of torque in the relay is reversed which reversal may be utilized to close the tripping circuitso that the main circuit is immediately opened.

My invention consists in providing a novel 3 5 reverse phase relay of exceedingly simple form, which 1s much more economical to con- I .struct than a relayof the induction motor ty e, and which is equallv eflicient and relia le ingiving the deslred protection.

My invention consists in providing a rectilinarly-movable member, with a plurality of coils connected to the circuit to be protected and arranged to roduce a progressive shifting of fiux in the ine of movement of said member, with means lornormally rein the normaldirection, and arranging the.

venting the movement. of said member w en the direction of the progression of the field 1s member to close a tripping circuit upon its movementin the opposite direction :upon a reversal of the direction of shifting of the .field.. .1

' Fig. 3 shows a detail on areduced scale of one of the laminatioris employed in the construc-' tion of the relay.

In Fig. 1, A and A re resent two coils which are energized from 'flerent phases of the polyphase circuitto be protected. These coils are supported Within a suitable box. or receptacle B, and are searated by circular laminations C which are formed with their electrical continuity broken, as indicated in Fig. 3, in ord r to prevent the circulation of eddy currents due to induction from the coils A, A. D represents a central laminated core formed of sheets-or wires of magnetic material. The l'amiiiations C and the boX B form a nearly closed magnetic circuit for each coil, and since the two coils are connected in different phases aprogression of field flux is obtained in one direction or the other axially with respect to the core ,1). It has been found that it is not essential that the box B should: be laminated. It may be made of cast iron, as indicated in the drawings. Between the core D and the coils is inserted a light tube E which is preferably made of aluminium so as to obtain good contends to produce a' lon itudinal rectilinear movement of the tubes The tube is normally held seated by gravity, and the coils A, A, are so connected that the normal progression of flux is in a downward direction so as to assist the weight of the tube in holding it seated. The tube carries at its upper end a contact F. which, when the tube E is raised, is adapted to engage and bridge the stationary contacts f f. A light spring e is inserted between the contact F and the tube E to take up any shock produced when contact ,F strikes the contacts This upward movement of the tube, and conse uent bridging of the contacts f f ispro uced whenever the phase relation of the currents in the coils ARA isreversed bya phase reversa'l in the circuit to which these coils are connected, and the bridging of the contacts f f may be utilized to open'the circuit/immediately.

The circuit system are shown diagrammatically in Fig.

- 2. 1, 2 and 3 represent the line-wires from which the threehase motor M is supplied.

a The coils A A o the relay are connected in series or in shunt with the motor leads either directly or through transformers I, I. When the contact F bridges the contact f a circuit is closed through the battery or ot er source of current G, and the tripping coils h h of the to trip it.

.berinthe opposite direction. .5

Exactly, the same arrangement of relay and circuit connections may'be emplo ed for a two-phase circuit as are shown or 'the three-phase circuit.

What I claim as-new and desire to secure by Letters Patent of the United States, is,-

member, a plurality of coils energized with currents of. difierent phase'and adapted to produce a progression of the flux along the me of movement of said member, means for normally restraining the movement of said member, and means operated; by -a 'movement of said member in the-opposite direction for opening said circuit.

2. In a relay, -a longitudinally-movable conducting member, a series of coils surroundingsaid'member and energized with currents of different phase wherebyea progression of the flux is produced axially with respect to said member, means for nor- 'mally restraining the movement of said member, and a switch contact erated by said member upon a movement 0 said mem- .3. In a relay, a central core, a series of vcoils surrounding said. core and 'ener ized' with currentsof different phase wher y a progression of flux is produced in an axial di-. rectlon m said core,.a normally-mo erative member movable upon a reversal of t e direc tion ofjprogression of flux in said core, and a. switch contact operated by the movement of said member;

. t. In a relay, a'central core, 'a series of co1 ls'surroundmg:'sa1d core and "ener ize'd.

currents .of difierent phase where 'y a progression of flux is produced in an axial direction-in said core, a light condueting tube connections for a three-phase 01. instead of 1. In a relay, in combination with a circuit. .to be protected, a rectilinearlymovable duce a rectilinear progression of flux, a rectilinearly-movable conducting member subjected to said flux, means for restraining the movement of said memb'erin the direction of the normal progression of said flux, and means for opening said circuit upon a movement of said member in the opposite direction.

6. In combination, a polyphase circuit a longitudinally movable conducting member, a series of coils surrounding said member and energized from different phases of said circuit whereby a progression of flux is pro- ;dueedaxially with respect to said member,

means for preventing a movement of said member in the direction of normal progression of said flux, a switch contact operated by the movement of said=member the op posite direction, and switches controlled by said contact and adapted to open said polyphase circuit. s

7. In combination, a polyphase circuit, a magnetic core, a series of coils surrounding said core and energized from different phases of said circuit whereby a progression of flux is produced in an axial direction in said core, a' light conducting tube surrounding said core, a contact operatively connected to said tube, means for preventing the movement of said tube in the direction of normal progres sion of said flux, a trip circuit arranged to be clbsd by said contact upon a movement of said tube'in the opposite direction, trip coils in said circuit, and switches controlled by said trip coils and adapted to open said poly phase circuit. A

8. In a relay, a series of axially-displaced coils energized -with currents of. different phase, a' rectilinearly-movable conducting member disposed-axially with respect to said coils, means for restraining the movement of said member in one direction, and-a switch contact operated by the movement of said member in the opposite direction.

9. In combination, apolyphasecircuit, a rectilinear movable member, a series of colls energized from the several phases of said cir-.

cuit and adapted to producea progression of.

. flux along'the line ,of movement of said member, means for "normally restraining the movement of saidmemben-and means operated by a movement of'said member in the opposite direction for opening said polypha'se circuit. r i

1 In combination, a polyphase circuit, t.

magnet core, a series of axially displaced site direction for opening said polyphase circoils surrounding said core and e'ner ized cuit. 10 from different phases of said circuit, a ight In witness whereof, I have hereunto set my conducting tube surrounding said core, hand this 2nd day of May,\1905.,

means for preventing the movement of said EDWARD M. HEWLETT.

tube in the direction of the normal progres Witnesses: sion of the flux to said coils, and means oper- BENJAMIN B. HULL, ated by a movement of said tube in the oppo- HELEN ORFoRD. 

